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QoS Signaling in 802.11u Expedited Bandwidth Request 802.11 has only four categories (voice, video, best effort, and background) Many STAs may request high-priority voice service EBR allows a STA to describe the reason that it is requesting service and the network can act accordingly Example: emergency calls and first-responder traffic can pre-empt “normal” voice traffic QoS Map 802.11 QoS settings only affect last-hop access; QoS Map allows APs and STAs to extend higher-layer QoS settings Ensures correct QoS treatment of frames even if destination networks use DSCP differently |